But they believe they have enough evidence to prove 21-year-old Patrick Mikes Jr. killed his father, according to reports from The Oakland Press, including the commingling of DNA in blood from Patrick Mikes Sr., 55, who was reported missing on July 29, and his son, a student at Notre Dame University.

Mikes Jr. was arrested on fraud charges after his father's disappearance, suspected of using his 16-year-old brother Andrew's credit card without authorization.